GLY 1102 Topic 8

question

At their maximum, Cretaceous seas covered approximately half of the present land area of the Earth
answer

False (1/3)
question

For most of the Mesozoic, __ occurred along the western margin of North America causing the formation of volcanic arcs and numerous collisional events of volcanic arcs and microcontinents
answer

subduction
question

Closer toward the margins of Pangaea, __ climates of altering wet and dry seasons were common
answer

monsoonal
question

Higher average temperatures cause some expansion of ocean waters and raise sea levels
answer

True
question

Although Pangaea was beginning to rift apart in the __, the still-connected continents facilitated widespread dispersal of the dinosaurs
answer

Triassic
question

If the average rate of seafloor spreading increases on a global basis, ridge volume decreases
answer

False (increase)
question

The Connecticut River Valley was a Mesozoic __ containing abundant dinosaur footprints
answer

rift basin
question

By the Middle Jurassic, sea level began to rise again, continuing to a high level in the __
answer

Late Cretaceous
question

Dry and hot desert conditions persisted in many interior continental areas of Pangaea during the Early and Middle Jurassic
answer

True
question

Rocks of the Upper Jurassic contain more diverse and abundant dinosaur fossils then those of the earlier Jurassic
answer

True
question

The Late Jurassic partial breakup of Pangaea and higher sea level increased the proximity of large land areas to the moisture of the ocean; as a result, climate become more continental (warmer with less seasonality) and drier
answer

False
question

Monsoons are caused by seasonal differences in temperatures and atmospheric pressure between oceans and continents
answer

True
question

During the Cretaceous, cool temperate forests covered the polar regions where there was seasonal snowfall and thick ice sheets
answer

False
question

The lack of global glaciation would case sea level to be:
answer

higher than today
question

At the peak of Mesozoic warmth, in the Cretaceous, the pole-to-equator temperature gradient was probably no more than __ degrees C
answer

20
question

The continued warm climate of the Late Cretaceous, combined with higher than average seafloor spreading rates, resulted in the highest sea level of the Mesozoic
answer

True
question

During the Early Cretaceous, conifers became dominant over cycads
answer

True
question

During the Triassic, Gondwana was north of the equator
answer

False
question

Higher Late Jurassic sea level flooded the low-lying portions of continents creating __ sea
answer

An epicontinental
question

Plate tectonic events inhibited early dinosaur dispersal
answer

False
question

During the Late Jurassic, an interior seaway called the __ Sea formed in North America, extending from the Arctic almost to the Gulf of Mexico
answer

Sundance
question

Flowering trees and grasses evolved during the Middle Triassic
answer

False
question

During the Jurassic, western North America was covered by expansive eolian sands
answer

True
question

Late Cretaceous lea level was so high that it flooded the entire Atlantic and Gulf coastal plains of the US
answer

True
question

The average elevation of physiographic regions of the ocean basins can change over time, as a consequence of changes in the rates of __
answer

Seafloor spreading
question

During the Late Cretaceous, forests grew in coastal Antarctica and in Canada as far north as 85 degrees N latitude
answer

True
question

The Tethys Seaway divided Africa from Europe in the Middle Jurassic, separating African dinosaurs from their cousins to the north
answer

True
question

The three geologic periods of the Mesozoic are, from the oldest to youngest,
answer

Triassic, Jurassic, Cretaceous
question

The rise of the Late Jurassic sea level continued into the Cretaceous
answer

True
question

Most sea level change during more recent ( last 2 million years ) geologic time has been the result of
answer

changes in glacial ice volume

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